Thanks guys. This is good enough for me; Iím going to switch to synthetic, and I will sleep just fine.
As far as the engine breaking in just fine with synthetics, yes it will. There is some debate about this if you are talking about initial start-up, depending on the rings and cylinder wall finish, but certainly after the first few hundred miles the rings are seated and ití* a non-issue.
However I do feel there is potentially a slight performance advantage that can be attained by getting the engine well worn in and loosened-up before switching to synthetic. Many vehicles run quicker in the ľ mile at 20,000 or even 50,000 miles than at a few thousand miles. Admittedly, ití* just a guess on my part as to what the effect this will have on this particular version of the Northstar engine.